Improvement in hollow augers



1,. D'EMING.

i Hollow Augers.

Patented Dc. 3, 1872.

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UNITED A STATES PATENT QEErcEC JOHN DEMING, OF SALEM, OHIO, ASSIGNOB OFONE-HALF HIS RIGHT TO A. R. SILVER, OF SAME PLACE.

IMPROVEMENT IN HOLLOW AUGERS.

Specification forming part of Letters Patent No. 133,5?0, datedDceember, 1872.

To all 'whom z't may concern:

Be it known that I, JOHN DEMING, of Salem, in the county of Columbianaand State ofOhio, have invented an Improved Hollow Auger;

- and I do hereby declare that the following is a full, clear, and exactdescription thereof, reference beinglhad to the accompanying drawingmaking part of this specification, in which- Figures 1, 2, 3, and etrepresent diiferent parts of the chuck or bit holder. Fig. 5 is adiametrical section through the bit-holder, showing the bits fixedrigidly in their places.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to certain novel improvements on hollow angersfor producing tenons on the ends of spokes and other objects, as will behereafter explained.

The following description of my invention will enable others skilled inthe art to understand it:

In the accompanying drawing, A represents the hollow stem, on the end ofwhich a circular head, B, is formed, into the periphery of which anannular V-shaped groove is made, and into the face of this head B fourradial depressions, G, are made from the central opening, as shown inFig. 2. The cap E is fitted loosely on the head B and segments d, sothat when screws F are loosened this cap will turn on head B. The screwsF, of which there are three, are cone-pointed, and they are tappedthrough the annular ange of the cap E, so that their cone points will bereceived into the V-shaped groove in the periphery of the head B, asshown in Figs. 3 and 5. The object of the screws F is to conne the bitsand blanks at any desired radial position, according to the diameter oftenon it is desired to produce. The bits g and blanks g are L- shaped,and their shanks are provided with studs z', which are received intocurved eccentric grooves J, shown in Fig. 4. When the cap E is loosenedand turned about its axis, the grooves J will cause the bits and blanksto move toward or from the axis of the chuck, and in this way the bit-sare adjusted for tenons of different diameters. The tightening of thebits and blanks is effected, when the screws F are set up, by theirconexpoints acting on one side of the V-shaped groove and drawing thecap E up hard against the Shanks of the bits and blanks, thus clampingthem between the cap and the face of the head B. By this means the cap Eis secured rigidly on head B, at the same time that the bits and blanksare confined in their places. By simply loosening ythe screws F the capE, as well as the bits l and blanks, are loosened and may be readilyadjusted. It will be seen by reference to Fig. 5, that the points of thescrews F are on one side of the center of the V-shaped groove. Thisproduces the drawing and clamping effeet above described.

Having described my invention, what I claim as new, and wish to secureby Letters Patent, is-

l. The combination of the hollow anger-stem A, having the circular headB, provided with the circular groove b, with the cap E having set-screwF, substantially as and `for the purpose herein set forth.

2. The arrangement of the head B, having radial depressions O, alsosegments d, and bits and blanks g and g', provided with studs c', withthe cap E, having eccentric grooves J and set-screws F, substantially asand for the purpose specified.

JOHN DEMING.

Witnesses:

N. A. MORLAN, N. B. WATSON,

